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These speed demons aren't for the fainthearted, but there's a smart way to invest in them all.

By way of an answer, consider the go-go likes of eBay(NASDAQ:EBAY), Yahoo!(NASDAQ:YHOO), Broadcom(NASDAQ:BRCM), and Amazon.com(NASDAQ:AMZN). Each of these large-cap race cars sports a price-to-earnings (P/E) ratio that sails past that of the S&P 500. Over the past 12 months, though, they've shed double-digit chunks of value. The same is true of revved-up small caps Red Hat(NYSE:RHT), CNET Networks(NASDAQ:CNET), and Affymetrix(NASDAQ:AFFX).

So what, exactly, is the problem? Call it the rosy scenario syndrome: Analysts expect each of the aforementioned to grow earnings by more than 20% over the next five years.

Isn't that good news?In the abstract -- and if the analysts actually turn out to be right -- that's good news indeed. The thing is, the market is especially efficient when it comes to pricing in (or "discounting" for) robust growth stories. The upshot? When big-picture economic data -- or industry-specific news -- comes along and mucks up the rosy growth story, priced-for-perfection high-fliers can head south in a hurry.

Which isn't to say you shouldn't own them. Companies with outsized growth prospects are nothing to sneeze at, particularly if you've got a stomach for volatility. That said, even if you consider yourself to be a regular investing Evel Knievel, a smart way to snag the market's riskier prospects is through world-class mutual funds: You'll get the market-beating potential of racy growth stocks along with a smartly constructed portfolio that should help tamp down wild performance swings.

Two for the price of oneBut not just any fund will do. As the Fool's resident fund geek, I'm on the lookout for:

1. Strategic tenacity: With growth investing largely in the doldrums ever since the market melted down back in early 2000, I'm especially interested in growth funds with managers that have stuck to their guns during the downturn, snapping up the kinds of companies they like at substantial discounts to their earnings-growth potential. After all, investing in otherwise rock-solid companies when their area of the market has fallen from favor means they're buying quality on the cheap.

2. Healthy skepticism: Managers who fall in love with a stock's "story" don't make the cut. When it comes to growth investing in particular, it's all too easy to become overly wowed and fall prey to "irrational exuberance." (See the late 1990s for the gory details). With that in mind, I want growth managers to be as unemotional about their work as possible -- and to have defined sell criteria. Yes, we should all be inclined to let our winners run. We shouldn't, however, let them run away.

3. Intelligently placed bets: Risk is baked into growth investing, and because I want to beat the market and get a good night's rest, I favor managers who run intelligently diversified portfolios. I'm not averse to funds that pack considerable sums into individual names or certain areas of the market. At the same time, I wouldn't advise diving whole hog into, say, a tech sector fund, either. There are smarter ways of getting the growth job done.

Speaking of which ...If you'd like to invest fearlessly in the market's "scariest" stocks, consider taking the Fool's Champion Funds service for a risk-free spin. Our overall list of recommendations is spanking the market by more than 11 percentage points as I type, and yep: We've zeroed in on a clutch of terrific growth funds, cherry-picked go-getters that have what it takes to get the market-beating job done.

Click here to give Champion Funds a go, and see what you think. There's absolutely no obligation to stick around if you find it's not for you, but remember: Even Evel Knievel eventually met his Snake River Canyon. If you'd like to avoid a similar fate as an investor, top-notch mutual funds make the ideal vehicle.

Shannon Zimmerman runs point on the Fool's Champion Funds newsletter service, and at the time of publication didn't own any of the securities mentioned above. eBay, Yahoo!, and Amazon.com are Motley Fool Stock Advisor recommendations. CNET Networks and Affymetrix are Rule Breakers picks. You can check out the Fool's strict disclosure policy by clicking right here.